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The Artful Bodger's nutating engine! |
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John Hill:
Thanks Eric. No Stew, it is not a Stirling, it is a single acting steam(or compressed air) engine. What makes it different is the sleeve extension to the piston that does the port action and the partial rotation of the piston that allows the up stroke port duration to be different to the down stroke port duration. |
John Hill:
Today is Saturday in God's Own Country and I have done my chores and duties for the day, it is a little wet outdoors so into the garage I will go. The challenge today is to get the design fixed and a start made on the wobbling-big-end, just how does one turn a 'Z' shaped shaft and get a bearing slid onto it? :scratch: |
John Hill:
Progress with the wonky big end! The selected bearing and the crank pin material, as you can see the bearing bore is much bigger diameter pin and measuring with my little protractor I found the axis of the bearing could be tilted to an angle of about 15 degrees with respect to the pin axis. A bit of scrap steel about twice the diameter of the bearing bore mounted in my new vertical slide and angled 15 degrees to the lathe centreline. While it is mounted in there I will chop the end to the angle using a fly cutter then drill a hole into the end at the 15 degree angle until it comes out the other side of the shaft. Testing the crank pin in the drilled shaft, it is a tight fit so I didnt try to force it right through. The shaft goes back in the lathe and is turned down to size of the bearing bore. And there we have it! The bearing is fitted to the crank pin at a 15 degree angle, all it needs is a little careful work with the hacksaw to remove the excess. With the bearing mounted at 15 degrees I will have almost 30 degrees of rotation of the piston/sleeve which I hope will be enough, more would be better though. So far everything is a nice friction fit which is good as I dont want to be trying to silver solder and cooking the bearing. |
Stilldrillin:
Well done so far John! :thumbup: I think I understand it........ Maybe...... :scratch: Watching with great interest...... :wave: David D |
sbwhart:
This really intrieging me John. Watching with great interest. Stew |
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